BlackCAT A Catalog of Stellar-Mass Black Holes in X-ray Binaries

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ID# 64

MAXI J1631-479

( Russell2019e )

RA     [J2000]     DEC

[]          []

16:31:14.22  -47:48:23.44

ℓ                      b

[deg]                            [deg]

336.2881394  +00.31248069

Year of discovery: 2018  
( Kobayashi2018 )

# of outbursts after discovery:

Basic data

Distance [kpc]
Distance to the plane (z) [kpc]
Orbital period (Porb) [h]
Peak X-ray flux [erg s-1 cm-2]
Outburst magnitude (AB)
Quiescent magnitude (AB)
E(B-V) [mag] 4.2 – 7.2 Miyasaka2018 Eijnden2019
Spectral type


MAXI J1631-479: Shin2019 reported a possible counterpart (VPHASDR2 J163114.1-474822.7) with i’=18.3. However it showed no optical variability compared to their observations (R ~ 19.1 and I ~ 18.0).
Later, Kong2019 detected another target 1.4” from the radio position with r’=19.36 ± 0.06 (calibrated against APASS) and R=18.13 ± 0.03 in DSS images from 1992.
The possible counterpart seems to be an interloper unrelated to the X-ray transient

Optical/NIR magnitudes

Mag. Outburst (AB)
Mag. Quiescent (AB)
Aladin finding chart
Scroll to zoom. Set survey image in "Manage layers"
Default image: DSS2 Red
MAXI J1631-479 in Simbad

Finding chart

This research has made use of NASA's Astrophysics Data System (ADS) and the SIMBAD database operated at CDS (Strasbourg, France)
Please acknowledge the use of this catalogue in any published work you derive from it.

Last modified: 27 August 2021.